Mathematical teaching block



FIG. 1 is a plan view of a mathematical teaching block showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational being a mirror image;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a sectional view thereof along the lines 6--6 in FIG. 4. 

The ornamental design for a mathematical teaching block, as shown and described. 